Was with GoDaddy, had some issue with DNN site they could not resolve. Move to a new hosting company that primarily handles DNN sites. Problem when migrating site to new hosting company DNN was installed into a subfolder (www.domain.org/dotnetnuke). Now if you type in the main domain (www.domain.org) the site will not appear. It just displays a link to the dotnetnuke folder and you have to click the link to get to the home.aspx page.  My hosting company tried to remove the contents from the subfolder to the root folder. This made things worse, the site could not be access at all using either of the url. What you would see in the address bar is www.domain.org/dotnetnuke/dotnetnuke/dotnetnuke... this would repeat continuously. I had them put the files back into the /dotnetnuke subfolder to access the site using www.domain.org/dotnetnuke. How can I redirect the main domain (www.domain.org) to access the subfolder (www.domain.org/dotnetnuke) with visitors typing just the main domain name?

If "auto add portal alias" option is not enabled, you may need mannually add a portal Alias for domain.org without the /dotnetnuke

First, move your files back in the dotnetnuke folder.
Then go to domain.org/dotnetnuke login and then go to site settings then the advanced tab and scroll to the Site Alias section.
Add a site alias for domain.org and make it primary.
Finnaly move your files to the root and try accessing it.